4.3.3 TAPE FORMAT

Data is transferred to cassette tape in the high speed/high density Format 2. Data tapes generated by the CR10 are read by the PC201 tape read card for the IBM PC or by the C20 Cassette Interface. The C20 decodes the tape and transmits the data in ASCII to any external device equipped with a standard RS232 interface.

TABLE 4.3-2. Format 2 Specifications

Data

Binary

Low Resolution

2 bytes/data point

High Resolution

4 bytes/data point

C-60 Capacity

180,000 data points

(Lo Res.)

(1 side only)

Data Transfer

100 data points/sec.

Rate (Lo Res.)

 

Block Size

512 Final Storage

locations

 

4.3.4 CONNECTING TAPE TO CR10

The procedure for setting up the CR10 and cassette recorder for transfer to tape is as follows:

1.Load a cassette in the recorder and advance the tape forward until the tape leader is past the recording head. (Internal batteries or AC power required.)

2.Connect the SC92A or SC93A to the 9-pin D-TYPE connector in the upper right-hand corner of the wiring panel. (Via the SC12 ribbon cable if using *8 with CR10KD or modem/terminal.)

3.Connect the plugs on the free end of the SC92A or SC93A into the DC-IN and MIC (and Ear if SC93A) jacks on the recorder.

4.Simultaneously press the RECORD and PLAY buttons on the recorder to set it for recording. With the DC-IN Jack plugged in, the tape will not move until the dump occurs.

5.To test connections manually initiate transfer by Keying in the *8 commands as listed in Table 4.2-1. The tape should advance as data is transferred. If the Start of dump location is equal to the End of dump location, the CR10 will write a "dummy" block of data to tape.

SECTION 4. EXTERNAL STORAGE PERIPHERALS

If you are leaving the recorder with the CR10 (on- line output to tape enabled with Instruction 96) it is a good idea to write a dummy block of data to tape (5 above) to ensure that the recorder is correctly connected. Leave the CR10 in the *0 Mode.

When on-line, the CR10 dumps data to tape in 512 location blocks (unless the option to dump any new data is selected in Instruction 96). When picking up a data tape from a field site, dump the residual data (data which has accumulated since the last full block) before removing the tape. Dump the residual data by entering the *8 Mode, advancing through windows 2 and 3 and initiating a dump. (The start and stop locations should be less than 512 locations apart.) After removing the old tape, insert a new tape and go through the set up steps above.

4.4 PRINTER OUTPUT FORMATS

Printer output can be sent in Final Storage Format (Appendix C.2), Printable ASCII, or Comma Delineated ASCII. These ASCII formats may also be used when data from the Storage Modules or Telecommunications are stored on disk with Campbell Scientific's PC208 software.

4.4.1 PRINTABLE ASCII FORMAT

In the Printable ASCII format each data point is preceded by a 2 digit data point ID and a (+) or (−) sign. The ID and fixed spacing of the data points make particular points easy to find on a printed output. This format requires 10 bytes per data point to store on disk.

Figure 4.4-1 shows both high and low resolution data points in a 12 data point Output Array. The example data contains Day, Hour-Minute, and Seconds in the 2nd - 4th data points. REMEMBER! You must specifically program the CR10 to output the date and time values. The Output Array ID, Day, and Time are always 4 character numbers, even when high resolution output is specified. The Seconds resolution is .125 seconds.

Each full line of data contains 8 data points (79 characters including spaces), plus a carriage return (CR) and line feed (LF). If the last data point in a full line is high resolution, it is followed immediately with a CR and LF. If it is low resolution, the line is terminated with a space, CR and LF. Lines of data containing less than 8 data points are terminated similarly after the last data point.

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